20989299552 has 48 divisors (see below), whose sum is σ = 59335138800. Its totient is φ = 6458245632.

The previous prime is 20989299503. The next prime is 20989299553. The reversal of 20989299552 is 25599298902.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20989299553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8407927 + ... + 8410422.

It is an arithmetic number, because the mean of its divisors is an integer number (1236148725).

Almost surely, 2^20989299552 is an apocalyptic number.

It is an amenable number.

20989299552 is an abundant number, since it is smaller than the sum of its proper divisors (38345839248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20989299552 is a wasteful number, since it uses less digits than its factorization.

20989299552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16818375 (or 16818367 counting only the distinct ones).

The product of its (nonzero) digits is 10497600, while the sum is 60.

The spelling of 20989299552 in words is "twenty billion, nine hundred eighty-nine million, two hundred ninety-nine thousand, five hundred fifty-two".